package com.atguigu.gulimall.cart.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.cart.feign.ProductFeignService;
import com.atguigu.gulimall.cart.interceptor.CartInterceptor;
import com.atguigu.gulimall.cart.service.CartService;
import com.atguigu.gulimall.cart.vo.Cart;
import com.atguigu.gulimall.cart.vo.CartItem;
import com.atguigu.gulimall.cart.vo.SkuInfoVo;
import com.atguigu.gulimall.cart.vo.UserInfoTo;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import com.atguigu.common.utils.R;

import java.math.BigDecimal;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.stream.Collectors;


@Slf4j
@Service
public class CartServiceImpl implements CartService {
    @Autowired
    StringRedisTemplate redisTemplate;
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    private ThreadPoolExecutor executor;
    private final String CART_PREFIX = "gulimall:cart:";
    @Override
    public CartItem addToCart(Long skuId, Integer num) throws ExecutionException, InterruptedException {
        BoundHashOperations<String,Object,Object> cartOps = getcartOps();

        String res = (String)cartOps.get(skuId.toString());
        if(StringUtils.isEmpty(res)){
//            购物车无此商品
            //1、远程查询当前要添加的商品信息
            //2、商品添加到购物车
            CartItem cartItem = new CartItem();
            //开启第一个异步任务
            CompletableFuture<Void> getSkuInfoTask = CompletableFuture.runAsync(() -> {
                R skuInfo = productFeignService.info(skuId);
                SkuInfoVo data = (SkuInfoVo) skuInfo.getData("skuInfo", new TypeReference<SkuInfoVo>() {
                });
                cartItem.setCheck(true);
                cartItem.setCount(num);
                cartItem.setImage(data.getSkuDefaultImg());
                cartItem.setTitle(data.getSkuTitle());
                cartItem.setSkuId(skuId);
                cartItem.setPrice(data.getPrice());
            },executor);
            //远程调用sku的组合信息
            CompletableFuture<Void> getSkuSaleAttrValues= CompletableFuture.runAsync(() -> {
                List<String> values = productFeignService.getSkuSaleAttrValues(skuId);
                cartItem.setSkuAttr(values);
            },executor);
            CompletableFuture.allOf(getSkuInfoTask,getSkuSaleAttrValues).get();
            String s = JSON.toJSONString(cartItem);
            cartOps.put(skuId.toString(),s);
            return cartItem;
        }else{
            //购物车有此商品,修改数量
            CartItem cartItem = JSON.parseObject(res,CartItem.class);
            cartItem.setCount(cartItem.getCount()+num);
            cartOps.put(skuId.toString(),JSON.toJSONString(cartItem));
            return cartItem;
        }



    }

    @Override
    public CartItem getCartItem(Long skuId) {
        //拿到要操作的购物车信息
        BoundHashOperations<String,Object,Object> cartOps = getcartOps();
        String redisValue = (String)cartOps.get(skuId.toString());
        CartItem cartItem = JSON.parseObject(redisValue,CartItem.class);
        return cartItem;
    }

    @Override
    public Cart getCart() throws ExecutionException, InterruptedException {
        Cart cart = new Cart();
        UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        if(userInfoTo.getUserId()!=null){
            //1、登录
            String cartKey =CART_PREFIX + userInfoTo.getUserId();

            //2、如果临时购物车的数据还没有进行合并
            String tempCartKey = CART_PREFIX+userInfoTo.getUserKey();
            List<CartItem> tempCartItems = getCartItems(tempCartKey);
            if(tempCartItems != null){
                //临时购物车有数据,需要合并
                for (CartItem item: tempCartItems) {
                    addToCart(item.getSkuId(),item.getCount());
                }
                //清除临时购物车的数据
                clearCart(tempCartKey);

            }
            //3、获取登录后的临时购物车的数据[包含合并过来的临时购物车的数据,和登录后的购物车的数据]
            List<CartItem> cartItems = getCartItems(cartKey);
            cart.setItems(cartItems);
        }else{
            //2、没登陆
            String cartKey = CART_PREFIX + userInfoTo.getUserKey();
            //获取临时购物车的所有购物项
            List<CartItem> cartItems = getCartItems(cartKey);
            cart.setItems(cartItems);
        }
        return cart;
    }

    @Override
    public void checkItem(Long skuId, Integer checked) {
        //查询购物车里面的商品
        CartItem cartItem = getCartItem(skuId);
        //修改商品的状态
        cartItem.setCheck(checked == 1 ? true : false);
        //序列化存入redis
        String redisValue = JSON.toJSONString(cartItem);
        BoundHashOperations<String,Object,Object> cartOps = getcartOps();
        cartOps.put(skuId.toString(),redisValue);
    }

    @Override
    public void changeItemCount(Long skuId, Integer num) {
        //查询购物车里面的商品数量
        CartItem cartItem = getCartItem(skuId);
        cartItem.setCount(num);
        BoundHashOperations<String,Object,Object> cartOps = getcartOps();

        //序列化存入redis中
        String redisValue = JSON.toJSONString(cartItem);
        cartOps.put(skuId.toString(),redisValue);
    }

    @Override
    public void deleteCartInfo(Integer skuId) {
        BoundHashOperations<String,Object,Object> cartOps = getcartOps();
        cartOps.delete(skuId.toString());
    }

    @Override
    public List<CartItem> getUserCartItems() {
        UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        if(userInfoTo.getUserId() == null){
            return null;
        }else{
            String cartKey = CART_PREFIX + userInfoTo.getUserId();
            List<CartItem> cartItems =getCartItems(cartKey);
            //获取所有被选中的购物项
            List<CartItem> collect = cartItems.stream().filter(item -> item.getCheck()).map(item ->{
                R price = productFeignService.getPrice(item.getSkuId());
                //TODO 1、更新为最新价格
                String data =(String)price.get("data");
                item.setPrice(new BigDecimal(data));
                return item;
            }).collect(Collectors.toList());
            return collect;
        }
    }

    private void clearCart(String cartKey) {
        redisTemplate.delete(cartKey);
    }

    private BoundHashOperations<String,Object,Object> getcartOps() {
        UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        String cartKey ="";
        if(userInfoTo.getUserId() != null){
            //gulimall:cart:1
            cartKey = CART_PREFIX +userInfoTo.getUserId();
        }else{
            cartKey = CART_PREFIX + userInfoTo.getUserKey();
        }
        BoundHashOperations<String,Object,Object> operations = redisTemplate.boundHashOps(cartKey);
        return operations;
    }
    private List<CartItem> getCartItems(String cartKey){
        BoundHashOperations<String,Object,Object> hashOps = redisTemplate.boundHashOps(cartKey);
        List<Object> values = hashOps.values();
        if(values != null && values.size()>0){
            List<CartItem> collect = values.stream().map((obj) ->{
                String str = (String)obj;
                CartItem cartItem = JSON.parseObject(str,CartItem.class);
                return cartItem;
            }).collect(Collectors.toList());
            return collect;
        }
        return  null;
    }
}
